USN-1272-1: Linux kernel vulnerabilities

21 November 2011

linux vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 10.10

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel

Details

It was discovered that CIFS incorrectly handled authentication. When a user had a CIFS share mounted that required authentication, a local user could mount the same share without knowing the correct password. (CVE-2011-1585)

Andrea Righi discovered a race condition in the KSM memory merging support. If KSM was being used, a local attacker could exploit this to crash the system, leading to a denial of service. (CVE-2011-2183)

Vasily Averin discovered that the NFS Lock Manager (NLM) incorrectly handled unlock requests. A local attacker could exploit this to cause a denial of service. (CVE-2011-2491)

Robert Swiecki discovered that mapping extensions were incorrectly handled. A local attacker could exploit this to crash the system, leading to a denial of service. (CVE-2011-2496)

It was discovered that the wireless stack incorrectly verified SSID lengths. A local attacker could exploit this to cause a denial of service or gain root privileges. (CVE-2011-2517)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 10.10
linux-image-2.6.35-31-generic - 2.6.35-31.62
linux-image-2.6.35-31-generic-pae - 2.6.35-31.62
linux-image-2.6.35-31-omap - 2.6.35-31.62
linux-image-2.6.35-31-powerpc - 2.6.35-31.62
linux-image-2.6.35-31-powerpc-smp - 2.6.35-31.62
linux-image-2.6.35-31-powerpc64-smp - 2.6.35-31.62
linux-image-2.6.35-31-server - 2.6.35-31.62
linux-image-2.6.35-31-versatile - 2.6.35-31.62
linux-image-2.6.35-31-virtual - 2.6.35-31.62

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well.

References